In this paper, we report an inverse strategy to design a directional emitter and power splitter based on two-dimensional photonic crystal waveguides (PCWs). Our approach is illustrated by employing a genetic algorithm in conjunction with the finite-difference time domain (FDTD) method to design a corrugated surface added behind the termination of PCWs. By arranging symmetrical or asymmetrical surface corrugations along the axis of a waveguide, we have successfully realized both a highly efficient directional emitter and an open-type Y-shaped power splitter from planar PCWs. Moreover, the angle of directional emission and split beams can be easily controlled by changing the location of the detector in the output area.
© 2009 Optical Society of America
Optics at Surfaces
Original Manuscript: July 28, 2009
Manuscript Accepted: September 11, 2009
Published: October 27, 2009
Liyong Jiang, Wei Jia, Haipeng Li, Xiangyin Li, Chunxiao Cong, and Zexiang Shen, "Inverse design for directional emitter and power splitter based on photonic crystal waveguide with surface corrugations," J. Opt. Soc. Am. B 26, 2157-2160 (2009)